James Crumbley, father of the Michigan school shooter, chose not to testify in his trial. Prosecutors sought to hold the Crumbleys responsible for the shooting, accusing James of failing to secure the gun used by his son. The trial focused on the gun purchase and storage, with testimony from law enforcement officials and witnesses to the shooting. The defense called only one witness, James's sister, who claimed they had no reason to be concerned about the son's behavior. Closing arguments are scheduled for Wednesday afternoon.